Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
nganh ky » nganh y, nganh xay, hanh ky
hanh dai » hanh tai, hanh dao, vanh dai
tang van » hoang van, trong van, tang luan
dang van » hoang van, hang va
vien dai » hien dai
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
dac va » duc va, day va, dat va
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nganh ky ((tang van) or (dang van)) hoi. hieu ((ve cac) or (vien dai)) dac va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ky ((tang van) OR (dang van)) hoi. hieu ((ve cac) OR (vien dai)) dac va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc nganh ky ((tang van) or (dang van)) hoi. hieu ((ve cac) or (vien dai)) dac va hanh dai cua tre*.